Active night vision image intensity balancing system
View Patent ↗A vision system ( 10 ) for a vehicle ( 14 ) includes a light source ( 46 ) that generates an illumination beam ( 20 ). A receiver ( 62 ) generates a first image signal and a second image signal. The first image signal is generated in response to a reflected portion of the illumination beam ( 20 ). A controller is coupled to the light source ( 46 ) and the receiver ( 62 ). The controller generates an image in response to the first image signal and the second image signal.
1. A vision system for a vehicle comprising:
a light source generating an illumination beam;
a receiver generating a first image signal and a second image signal, at least one of said first image signal and said second image signal being generated in response to at least a reflected portion of said illumination beam; and
a controller coupled to said light source and said receiver, said controller generating an image in response to said first image signal and said second image signal;
wherein said receiver in generating a first image signal and a second image signal generates an illuminated image signal having pixel intensity values I b and a non-illuminated image signal having pixel intensity values I d ;
wherein said controller generates said image in response to a maximum image intensity threshold I b,max and a minimum image intensity threshold I b,min ; and
wherein said controller determines pixel intensity values of at least a portion of said image to be approximately equal to
I
avg
-
(
I
b
,
max
-
I
b
)
(
I
avg
-
I
b
,
min
)
Δ
,
where average intensity values I avg are approximately equal to
I
b
+
I
d
2
and threshold difference Δ is approximately equal to I b,max −I b,min .
2. A vision system for a vehicle comprising:
a light source generating an illumination beam;
a receiver generating a first image signal and a second image signal, at least one of said first image signal and said second image signal being generated in response to at least a reflected portion of said illumination beam; and
a controller coupled to said light source and said receiver, said controller generating an image in response to said first image signal and said second image signal;
wherein said receiver in generating a first image signal and a second image signal generates an illuminated image signal having pixel intensity values I b and a non-illuminated image signal having pixel intensity values I j ; and
wherein said controller determines pixel intensity values of at least a portion of said image to be approximately equal to
I
b
1
+
(
I
b
-
I
d
)
β
,
where β is a predetermined value.